{"id":2428,"date":"2026-06-30T08:59:20","date_gmt":"2026-06-30T08:59:20","guid":{"rendered":"https:\/\/hydrauliccylindersprice.com\/product\/live-molds-hydraulic-cylinder-for-vulcanizing-machine\/"},"modified":"2026-06-30T08:59:27","modified_gmt":"2026-06-30T08:59:27","slug":"live-molds-hydraulic-cylinder-for-vulcanizing-machine","status":"publish","type":"product","link":"https:\/\/hydrauliccylindersprice.com\/cs\/produkt\/live-molds-hydraulic-cylinder-for-vulcanizing-machine\/","title":{"rendered":"Live Molds Hydraulic Cylinder for Vulcanizing Machine"},"content":{"rendered":"

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\n Vulcanizing Machine<\/span>
\n Live Molds Cylinder \u00b7 7th of 7 \u2014 Family Complete<\/span>\n <\/div>\n

9 Segments. 9 Cylinders.
One Seamless Tread.<\/h2>\n

A tire tread has deep grooves that would trap a two-piece mold \u2014 the mold could not open vertically without tearing the tread pattern. The solution: split the tread mold into 7\u20139 radial segments that slide inward to close around the tire and outward to release it. Each segment is driven by its own live molds cylinder. All 7\u20139 cylinders must close at the same speed to the same radial position \u2014 forming a precision ring with no gaps, no steps, and no flash lines.<\/p>\n

\n
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798 KN<\/div>\n
Max Thrust<\/div>\n<\/div>\n
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90\u2013220mm<\/span><\/div>\n
Bore<\/div>\n<\/div>\n
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\u2264900mm<\/span><\/div>\n
Stroke<\/div>\n<\/div>\n
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7\u20139<\/div>\n
Cylinders per Mold<\/div>\n<\/div><\/div>\n<\/p><\/div>\n<\/section>\n

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Why a Tire Mold Cannot Be Two Halves \u2014 The Undercut Problem<\/h2>\n

A tire tread has deep circumferential grooves (3\u201310 mm deep) and lateral sipes (thin slits) that wrap around the tread surface. If the mold were two halves opening vertically (like an injection mold), the cured rubber in these grooves would lock against the mold \u2014 the mold could not open without tearing the tread pattern. These grooves are “undercuts” in mold design terminology: features that prevent straight-pull separation of a two-piece mold.<\/p>\n

The segmented mold solves this: the tread area is divided into 7\u20139 pie-shaped segments arranged radially around the tire. Each segment slides radially outward to release the tread \u2014 the grooves open along their length, not across their width, so the rubber slips out without tearing. Each segment is driven by its own live molds cylinder, which pushes it inward (closed) or pulls it outward (open). Korea Ever-Power manufactures the live molds cylinder as the seventh and final component of the vulcanizing machine cylinder family<\/a>.<\/p>\n

\"Live
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Technical Specifications<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n\n
Parameter<\/th>\nValue<\/th>\n<\/tr>\n<\/thead>\n
Product<\/td>\nLive Molds Hydraulic Cylinder for Vulcanizing Machine<\/td>\n<\/tr>\n
Function<\/td>\nDrive each tread segment radially inward\/outward<\/td>\n<\/tr>\n
Bore Diameter<\/td>\n90 mm \u2013 220 mm<\/td>\n<\/tr>\n
Rod Diameter<\/td>\n50 mm \u2013 140 mm<\/td>\n<\/tr>\n
Stroke<\/td>\n\u2264 900 mm<\/td>\n<\/tr>\n
Maximum Thrust<\/td>\n798 KN (bore 220 mm \/ pressure 21 MPa)<\/td>\n<\/tr>\n
Quantity per Mold<\/td>\n7\u20139 (one per tread segment)<\/td>\n<\/tr>\n
Certification<\/td>\nISO 9001 \u00b7 100% hydrostatic tested \u00b7 matched set<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n<\/section>\n

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9 Cylinders, One Ring \u2014 Why Synchronisation Is Everything<\/h2>\n

Imagine 9 pie slices sliding inward to form a complete pie. If one slice arrives before the others, it pushes against the tire unevenly \u2014 distorting the tread on that segment. If one slice arrives after the others, a gap remains \u2014 uncured rubber squeezes through the gap, creating a “flash line” (a thin ridge of excess rubber) on the tread surface that must be trimmed manually. The 9 live molds cylinders must close at the same speed and arrive at the closed position within \u00b10.1 mm of each other.<\/p>\n

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\n Matched bore diameters<\/strong><\/p>\n

All 7\u20139 cylinders are manufactured from the same bore-diameter batch. Any variation in bore diameter between cylinders means different piston areas \u2014 which at the same pressure produces different forces and different speeds. Korea Ever-Power holds the bore diameter to a mutual tolerance across the entire set so that at common hydraulic pressure, all cylinders extend at the same speed.<\/p>\n<\/p><\/div>\n

\n Flow divider circuit<\/strong><\/p>\n

A flow divider splits the pump output equally among all 7\u20139 cylinders \u2014 delivering the same volume of oil to each cylinder per unit time. Equal flow + matched bore area = equal speed. The flow divider compensates for small differences in friction between cylinders, keeping all segments moving inward together.<\/p>\n<\/p><\/div>\n

\n Mechanical final positioning<\/strong><\/p>\n

Even with matched cylinders and a flow divider, tiny speed differences can accumulate over the 900 mm stroke. The final 10\u201320 mm of closure uses mechanical taper guides on the mold container that force each segment into its precise radial position \u2014 the hydraulic cylinder provides the driving force, and the taper guides provide the final alignment. Contact the hydraulic cylinder engineering team<\/a> for matched live molds cylinder sets.<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/p><\/div>\n<\/section>\n

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Segment Alignment = Tread Quality \u2014 What the Driver Sees and Feels<\/h2>\n
\n \"Tread<\/p>\n

The tread segments carry the tread pattern \u2014 the most visually prominent part of the tire and the surface that contacts the road. Every seam between adjacent segments is a potential quality defect point: a visible flash line (excess rubber at the segment junction), a step (one segment slightly higher than the adjacent one, creating a tread height discontinuity), or a pattern mismatch (the groove on one segment does not align perfectly with the groove on the adjacent segment).<\/p>\n

Flash lines are trimmed manually \u2014 adding labour cost and creating a potential for trimming damage. Steps create tread height variation that affects tire uniformity (radial force variation, the same RFV that the bead concentricity cylinders #31\/#32 also influence). Pattern mismatches are cosmetic defects visible to the end customer.<\/p>\n

All three defects are reduced by precise radial synchronisation of the live molds cylinders \u2014 which is why the cylinders are manufactured as a matched set and the hydraulic circuit uses a flow divider rather than individual valve control for each segment.<\/p>\n<\/p><\/div>\n

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\n \"Live
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The Complete Vulcanizing Machine Cylinder Family \u2014 Seven Types, One Press<\/h2>\n
\n\n\n\n\n\n\n\n\n\n\n\n
#<\/th>\nCylinder<\/th>\nBore<\/th>\nQty<\/th>\nRole<\/th>\n<\/tr>\n<\/thead>\n
28<\/td>\nTipping<\/td>\n50<\/td>\n1<\/td>\nFlip cured tire<\/td>\n<\/tr>\n
29<\/td>\nPressurised<\/td>\n90\u2013220<\/td>\n1\u20132<\/td>\nClamp mold during cure<\/td>\n<\/tr>\n
30<\/td>\nMold Open\/Close<\/td>\n50\u2013140<\/td>\n1\u20132<\/td>\nRaise\/lower dome<\/td>\n<\/tr>\n
31<\/td>\nUpper Ring<\/td>\n50\u2013140<\/td>\n1<\/td>\nGrip upper bead<\/td>\n<\/tr>\n
32<\/td>\nLower Ring<\/td>\n50\u2013140<\/td>\n1<\/td>\nGrip lower bead<\/td>\n<\/tr>\n
33<\/td>\nLoading\/Unloading<\/td>\n63\u2013100<\/td>\n1\u20132<\/td>\nTransfer tire in\/out<\/td>\n<\/tr>\n
34<\/td>\nLive Molds<\/td>\n90\u2013220<\/td>\n7\u20139<\/td>\nClose tread segments<\/td>\n<\/tr>\n<\/tbody>\n<\/table><\/div>\n

Total cylinders per segmented-mold vulcanizing press: 13\u201317 individual units across 7 types. Korea Ever-Power supplies the complete set from a single source \u2014 all cylinders engineered for the same press’s hydraulic system, temperature environment, and cycle time. Single-source supply guarantees system compatibility and simplifies spare parts management.<\/p>\n<\/section>\n

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Manufacturing \u2014 7\u20139 Identical Cylinders, One Matched Set<\/h2>\n
\n \"Korea<\/p>\n

The live molds cylinder set is the largest matched-set order in the vulcanizing cylinder family \u2014 7\u20139 identical cylinders that must produce identical speed and force at the same hydraulic input. Korea Ever-Power machines all cylinders in a set from the same bore-diameter stock, hones all bores in the same production run, and assembles all cylinders with seals from the same batch \u2014 minimising any variation in friction characteristics between units.<\/p>\n

The bore (90\u2013220 mm) is honed to Ra 0.2\u20130.4 \u00b5m. FKM seals are standard \u2014 the cylinders operate at the mold’s peripheral temperature (80\u2013140 \u00b0C depending on proximity to the steam-heated container). Chrome plating is 50\u201380 \u00b5m. The stroke (\u2264900 mm) is the segment’s radial travel distance from the fully open (retracted) position to the fully closed (extended) position.<\/p>\n

Every cylinder in the set is individually hydrostatic tested at 1.5\u00d7 working pressure (31.5 MPa). The complete set is then speed-tested together \u2014 all 7\u20139 cylinders connected to a common flow divider, extending simultaneously \u2014 to verify matched extension speed across the set. Any cylinder that deviates beyond the synchronisation tolerance is reworked or replaced before the set ships.<\/p>\n<\/p><\/div>\n

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OEM & ODM<\/h2>\n
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What You Provide<\/h3>\n<\/div>\n
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Number of tread segments (7, 8, or 9), segment weight, radial travel distance (stroke), required closure force per segment, closing speed and synchronisation tolerance, mold container geometry (segment slide arrangement), ambient temperature at the cylinder mounting position, flow divider specification, and the segmented mold assembly drawing. Optionally ordered with the complete 7-type vulcanizing press cylinder set.<\/p>\n<\/div><\/div>\n

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What the Factory Delivers<\/h3>\n<\/div>\n
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Matched set of 7\u20139 cylinders with engineering drawing, bore mutual tolerance, FKM seal specification, chrome plating detail, and flow divider compatibility. Individual hydrostatic test + matched-set synchronisation speed test. Seal kits for the complete set. Browse the complete vulcanizing machine cylinder family<\/a> and the full hydraulic cylinder product range<\/a>.<\/p>\n<\/div><\/div>\n<\/p><\/div>\n<\/section>\n

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FAQ<\/h2>\n
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Can one cylinder in the set be replaced individually?<\/h3>\n

Yes \u2014 provide the serial number of the existing set and Korea Ever-Power will manufacture a replacement cylinder matched to the original set’s bore diameter and friction characteristics. The replacement cylinder is speed-tested against a reference from the same original set (if available) or against the set’s original test data. If the entire set is ageing uniformly, replacing all 7\u20139 at once is more cost-effective than sequential single replacements.<\/p>\n<\/p><\/div>\n

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Do all tire sizes use segmented molds?<\/h3>\n

Most modern passenger car, light truck, and truck tires use segmented molds \u2014 the tread patterns are too aggressive for two-piece molds. Some simple tread patterns (certain agricultural, industrial, and vintage vehicle tires) can still use two-piece molds without live molds cylinders. The trend in the industry is toward segmented molds for all applications \u2014 driven by demand for more complex tread designs with deeper grooves and finer sipes for wet-weather performance.<\/p>\n<\/p><\/div>\n

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How do the live molds cylinders coordinate with the pressurised cylinder (#29)?<\/h3>\n

The closing sequence is: mold opening\/closing cylinder (#30) lowers the dome \u2192 live molds cylinders (#34) close the tread segments inward \u2192 pressurised cylinder<\/a> (#29) applies clamping force \u2192 bladder inflates \u2192 cure begins. The opening sequence reverses: pressurised cylinder releases \u2192 live molds cylinders retract the segments outward \u2192 dome rises. The interlocks ensure the segments are fully closed before the pressurised cylinder applies force \u2014 closing on a partly retracted segment would crush the segment’s precision guides. Browse forklift cylinders<\/a> and telescopic cylinders<\/a> for other multi-cylinder synchronisation applications.<\/p>\n<\/p><\/div>\n<\/p><\/div>\n<\/section>\n

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Related Categories<\/h2>\n
\n <\/p>\n
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\"Telescopic\"<\/div>\n
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Telescopic Hydraulic Cylinders \u2192<\/div>\n
Dump truck, trailer, hoist.<\/div>\n<\/div>\n<\/div>\n

<\/a>
\n <\/p>\n

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\"Forklift\"<\/div>\n
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Forklift Hydraulic Cylinders \u2192<\/div>\n
Lift, tilt, steer \u2014 OEM.<\/div>\n<\/div>\n<\/div>\n

<\/a>
\n <\/p>\n

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\"AWV\"<\/div>\n
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Aerial Work Vehicle Cylinders \u2192<\/div>\n
Scissor, boom, platforms.<\/div>\n<\/div>\n<\/div>\n

<\/a>\n <\/div>\n<\/section>\n

<\/main><\/p>","protected":false},"excerpt":{"rendered":"

Live molds hydraulic cylinder for vulcanizing machine \u2014 the actuator that drives each radial segment of a segmented (split-pattern) tread mold inward to close around the tire, and outward to release it after cure. A segmented mold has 7\u20139 tread segments, each driven by its own live molds cylinder \u2014 all must close simultaneously, at the same speed, to the same radial position, to form a seamless ring with no gaps between segments. Any misalignment creates a visible flash line on the cured tire’s tread surface. The seventh and final cylinder type in the Korea Ever-Power vulcanizing machine cylinder family. Bore 90\u2013220 mm, stroke \u2264900 mm, 21 MPa, 798 KN. Korea Ever-Power. ISO 9001. OEM & ODM.<\/div>","protected":false},"featured_media":2429,"comment_status":"closed","ping_status":"open","template":"","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":""},"product_brand":[],"product_cat":[852],"product_tag":[],"class_list":["post-2428","product","type-product","status-publish","has-post-thumbnail","product_cat-industrial-engineering-hydraulic-cylinders","pa_editor-cxm","first","instock","product-type-simple"],"_links":{"self":[{"href":"https:\/\/hydrauliccylindersprice.com\/cs\/wp-json\/wp\/v2\/product\/2428","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/hydrauliccylindersprice.com\/cs\/wp-json\/wp\/v2\/product"}],"about":[{"href":"https:\/\/hydrauliccylindersprice.com\/cs\/wp-json\/wp\/v2\/types\/product"}],"replies":[{"embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/cs\/wp-json\/wp\/v2\/comments?post=2428"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/cs\/wp-json\/wp\/v2\/media\/2429"}],"wp:attachment":[{"href":"https:\/\/hydrauliccylindersprice.com\/cs\/wp-json\/wp\/v2\/media?parent=2428"}],"wp:term":[{"taxonomy":"product_brand","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/cs\/wp-json\/wp\/v2\/product_brand?post=2428"},{"taxonomy":"product_cat","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/cs\/wp-json\/wp\/v2\/product_cat?post=2428"},{"taxonomy":"product_tag","embeddable":true,"href":"https:\/\/hydrauliccylindersprice.com\/cs\/wp-json\/wp\/v2\/product_tag?post=2428"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}